Process for dyeing regenerated cellulose materials



Patented Apr. E5, 1930 UNITED. STATES {PATENT OFFICE HENRY JORDAN, OF WILMINGTON, DELAWARE, ASSIGNOR' TO E. I. DU FONT DE NE MOURS & COMPANY, OF WILMINGTON, DELAWARE, A: CORPORATION OF DELAWARE iraocnss r03 DYEIN'G-REGENERATED CELLULOSE MATERIALS No Drawing.

viscose, is a difficult task, as most ordinary.

cotton dyes will produce uneven dyeings.

The surprising discovery has been made that certain disazo dyes will givevery level shades 1 on these fibers. This invention therefore relates particularly to processes for dyeing re generated cellulose material with disazo 2 dyes of the following general formula R being an aromatic radical, not containing a free hydroxylor amino group, R being 2-amino-5-naphthol-7 sulphonic acid or an N-substituted derivative thereof, X being asulpho group-0r hydrogen, and.- .Y being hydrogen or 'a sulpho group, there being not more than one sulph'o group in the nucleus;

40 The shades obtained vary from violetto blue,

especially the blue shades beingvery valuable for this class of dyes.

By way ofillustration the following eaample is furnished showing a method for applying dyes of this type: ,i

Application filed September 11, 1928. Serial No. 305,330.

100 parts of rayon (knit or'woven materlal) are circulated in a bath of 4000 parts of water and 2 parts of neutral soap for a about 10 minutes at a temperature of 40 G. Then there is added slowly a concentrated solution of one part of the dye may vary between about 10% to 30% based on the materials to be dyed or it may be substituted by sodium chloride, in which case about 5% to 15% will be required. .For heavier dyeings the larger percentage of salt would be advisable. i The neutral soap may be substituted by a soluble oil, as double sulphonated castor oil.

The duration of the treatment and temperature of the operation may be varied within wide limits, but the preferred temperatures dyes having the general formula indicated above. The table following lists a number of shades, obtained by various combinations,

to which a large number of similar combinations may be added I claim:

1. The-process'of coloring regenerated cel- The dyes may be prepared, for instance in case 4, by diazotizing l-acetyl-amino-i-aminonaphthalene-6-sulphonic acid, coupling the diazo compound to alpha naphthylamine, diazotizing the amino azo compound again, coupling the diazo azo compound to 2-amino- -na-phthol-7-sulphonic acid, and'finally saponifying the dye by boiling with sodium hydroxide. The other dyes may be preparedin a similar Way.

As many apparently widely different embodiments of this invention may be made without departing from the spirit and scope thereof, it is to be understood that I do not limit myself to the specific embodiments thereof except as defined in the appended claims.

5 First component Middle component End component Shade N=N m-toluldlne- 2-amin0-5'naphtho1-7-sulphoni0acid.-- Violet.

(2) Same OCH: Same Red shade blue.

NH, (cl'esidine) (3) Same Same Pl enylg-amino'fi-naphthol-7-su1pl1on- Red shade blue.

(4) Samel. l-naphthylamine 2-amino-fi-naphthlfl-sulphonic acid..- Navy blue,

N: Ramn Same Navy blue.

N=N l-naphthylamlne-e-sulohonic acid- Same Bright blue (7) Same Same Pl enyl-2-amino-5-naphthol-7-sulphon- Bright blue 10 1c acid.

(8) Same NE: Same... -L; Bright,verygreenshadehlue.

lulose materials which comprises applying thereto a dye of the formula:

B, being an aromatic radical, not containing a free hydroxylor amino group, R being 2-amino-5-naphthol-7-su1ph0nic acid oran N- substituted derivative thereof, X being a sulphogroup or hydrogen, and Y being-hydrogen or a sulpho group, there being not more than one sulpho group in the nucleus.

2. The process of coloring regenerated cellulose materials which comprises treating the pho group or hydrogen,

same with a dye of the formula:

N=NR1N=N-'R1 (B, being an aromatic radical, not containing and Y being hydrogen or a sulpho group, there being not more than one sulpho group in the nucleus.

In testimony where lulose materials which comprises treating the same with a dye of the formula:

N=N-R1N=N.Rz

(R being an aromatic radical, not'containing a free hydroxylor amino grou'p, R being 2-amino-5naphthol-7-sulphonic acid or an N- substituted derivative thereof, X being a sulpho group or hydrogen, and Y being hydrogen or a sulpho group, there being not more than'one sulpho group in the .nucleus) in a neutral bath containing-from 10 to 30% sodium sulphate (based on the weight of the material to be dyed) and at a'te'mperature be-' 'lulose materials which COIIIPIISGS,

tween 50 and 90 C.

4. The process of coloring-regenerated celpp y thereto a dye of the formula:

5. A regenerated cellulose material dyed- R being an aromatic radical, not'containing a free hydroxyle or amino group, R being 2-amino-5-naphthol-7-sulphonic acid or an N- substituted derivative thereof, X being a sulv v on N=N N=N NaOz NH-Ocl:

of, I aflixmysignature. HENRY JORDAN. 

